About the books

Here is a short summary of each book from Wikipedia:

Magyk-
The book begins with Silas Heap finding an infant girl in the snow as he returns home with herbal medicines for his wife Sarah. Silas hides her in his cloak and takes her; on the way home, he is told by the ExtraOrdinary Wizard Marcia to raise her as his own, without telling anyone where she came from. As he returns home, the midwife runs out carrying his newborn son, Septimus Heap, pronouncing him dead. Soon after, Silas and Sarah name the baby girl Jenna and treat her as their own child.

Some years later, the ExtraOrdinary Wizard Marcia Overstrand returns and reveals Jenna to be the daughter of the assassinated queen, and takes her away for protection. However, the assassin, called the Hunter, follows them, and along with several of her family members, Marcia, and a member of the Young Army named "Boy 412", Jenna escapes to their Aunt Zelda's cottage in the Marram Marshes. In the marshes, Boy 412 discovers both a glowing ring and his own magykal powers.

Marcia attempts to return to the castle, but is captured by the guards and dungeoned for a month. While she is imprisoned, she nearly dies. Eventually, the Hunter discover where the group is staying and returns to assassinate Jenna, but he is thwarted by Aunt Zelda's freezing spell. They capture DomDaniel's apprentice, who claims to be Septimus, but he escapes and tells DomDaniel of their location.

In the end, Boy 412 is revealed to be Septimus Heap. DomDaniel had ordered the midwife to take Septimus, who was the seventh son of a seventh son and expected to have great magykal powers, but accidentally ended up with one of the boys from the army nursery, leaving Septimus to grow up in the army as Boy 412.[2]

Flyte-
In the second book we see Septimus as the apprentice to Marcia, the ExtraOrdinary Wizard. When Simon Heap, the eldest Heap brother kidnaps Jenna, Septimus goes out to search for her. He is assisted in his search by his friend Beetle. But Jenna runs away from Simon's observatory in The Badlands and makes her way towards The Port. Eventually Septimus is able to rescue Jenna with his elder brother Nicko's help from the Port but they are tracked by Sleuth, Simon's tracking ball.

They make their way to the Marram Marshes where they take the Dragon-Boat from Aunt Zelda's cottage and fly her to the Castle. But they meet Simon, flying in the sky. Simon drops a huge Thunderflash on the Dragon-Boat and it drops over Jannit Marten's Boatyard. Septimus, Jenna and Aunt Zelda are able to revive her through the Transubstantiation Triple spell.

Septimus is also in search of the long lost Flyte charm. He finds the separated charm and unites it along with the small arrow Flyte charm that Marcia had given him as a token for his apprenticeship. Eventually he is able to fly and even warns Simon never to harm Jenna again. Also, the rock that Jenna gave him at Aunt Zelda's cottage turns out to be the egg of a dragon and eventually it hatches. Septimus absolutely adores the dragon and names him Spit Fyre. The dragon for some strange reason identifies Marcia as his mummy, much to Marcia's annoyance.

Septimus rescues Marcia by identifying the shadow that has been trailing her. He also finds out that the ShadowSafe Marcia is developing contains, unbeknown to her, the bones of destroyed Necromancer DomDaniel, which, once reassembled, tried to kill Marcia. With Septimus's help, Marcia is able to Identify him and he is once again destroyed.[2]

Physik-
In "Physik" we find that when Silas Heap and Gringe the gatekeeper accidentally sets free the spirit of an evil Queen Etheldredda, everything seems to be in trouble. The Queen sends Septimus to her 500 year old son Marcellus Pye who drank the potion of Immortality. The old Marcellus then sends him back in time to the young Marcellus Pye and there Septimus becomes his apprentice and learns about "Physik". Marcia learns about Septimus' departure from Marcellus's book I, Marcellus in the Wizard Tower library, when she finds a page, 500 years old with Septimus's writing in it.

Jenna and Nicko, with Alther Mella and Alice Nettles help try to find Septimus. They meet Snorri Snorrelssen, a Northern Trader girl. Together they fall off through a glass into the past 500 years back. There Jenna is mistaken for the lost princess Esmeralda and dragged to her mother, the living Queen Etheldredda. She somehow manages to run and finds Septimus. Together all of them try to pass back through the doors of time, but Etheldredda and Marcellus come in arguing about when the Queen have the Drink of Immortality (really bad grammar that I don't know how to fix) . Although Marcellus warns the Queen that the drink is incomplete, she nevertheless drinks it.

They then discover Jenna and the others hiding in the Alchemie Chamber and Etheldredda drags Jenna to drown her but in the process she herself gets drowned. Since she drank the incomplete potion her spirit has an incomplete form neither immortal nor, a complete Spirit. Septimus, Jenna, Nicko and Snorri's cat Ullr then start their journey through the Doors of Time but Nicko runs away in search of Snorri.

Septimus and Jenna return to the Castle, much to the surprise and delight of Marcia Overstrand, who welcomes her apprentice back with an enormous hug. But Etheldredda's ghost tries to kill Jenna with the I.P (Infant Princess) bullet that was named for Jenna by the Assassin in Magyk. She is about to shoot the bullet when Alice Nettles hurls herself in front of Jenna and the bullet kills her. Marcia then draws a BoneFyre from Spit Fyre's fire and destroys Etheldredda's portrait hence Etheldredda and her pet, the Aie-Aie, which had caused a Sicknesse all through the Castle, are finished. Septimus, with his Physik knowledge is able to brew up an antidote for the Sicknesse and soon all is well. He promises to make a potion for Restoring youth for Marcellus and in return Marcellus would give him back his Flyte charm.

Queste-
Queste takes Septimus, Jenna and Beetle in search of Nicko and Snorri, to bring them back from the past. They go to Marcellus Pye, who has remembered some information from his 500 year old memory and provides them with some notes from Nicko and Snorri. The notes say that they planned to travel to the House Of Foryx where all times meet, and there they expected to come back to their time. Jenna takes the notes back with her to the Palace.

In the meantime, Merrin Meredith travels to the Castle in hope of destroying Septimus. He bumps into Jenna who drops all the notes of Nicko and Snorri, they get wet. Jenna goes to the The Manuscriptorium and asks Beetle to help her Replace the notes. Beetle then takes her to the restoration specialist Ephaniah Grebe. Ephaniah is a half man half rat being. He Restores the pages and binds them in to a book. But they still missed one piece, the centre of the map to the House of Foryx.

Merrin has in the meantime, takes the job of a scribe in the Manuscriptorium. There he meets the ghost of Tertius Fume, the first Chief Hermetic Scribe. Tertius makes him transfer the loyalty of the Thing to him and assures that he will send Septimus on a perilous Queste. Tertius Fume arrives at the Wizard Tower along with the ghosts of all the previous ExtraOrdinary Wizards and announces that they are about to draw the Queste stone. Septimus feels a Darkenesse inside the urn where the stone is kept and tells that a Thing is there to sabotage the draw. They escape the Wizard tower as Tertius Fume puts it under Siege. But accidentally Septimus takes the Queste stone thinking it to be a KeepSafe.

Septimus, Jenna and Beetle start their journey to the House of Foryx. Sam Heap shows them the way. They eventually reach the House and find Ephaniah near it. He had found the last missing piece of the map but was possessed by the Thing. Septimus, Jenna and Beetle enter the House of Foryx, but accidentally all three of them go inside. There Septimus is taken inside a door by a girl and Septimus finds himself face to face with Hotep-Ra, first ExtraOrdinary wizard. In the meantime Jenna and Beetle find Nicko and Snorri and all of them try to escape the House of Foryx. Just as they were about to leave, Marcia and Sarah arrive outside the house on Spit Fyre, so all of them are able to return to their own time.[2][3]